package com.zj.easytotwitter.util;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.os.Build;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicBlur;
import android.view.View;

/**
 * Created by XTER on 2016/7/8.
 */
public class BitmapUtils {

	/**
	 * 兼容处理
	 * 
	 * @param context
	 *            上下文
	 * @param bitmap
	 *            模糊位图
	 * @param view
	 *            模糊区域
	 * @param radius
	 *            模糊半径
	 */
	public static void blur(Context context, Bitmap bitmap, View view, int radius) {
		if (Build.VERSION.SDK_INT > 17) {
			blurByRender(context, bitmap, view, radius);
		} else {
			blurByGauss(context, bitmap, view, radius);
		}
	}

	/**
	 * 兼容处理
	 * 
	 * @param context
	 *            上下文
	 * @param bitmap
	 *            模糊位图
	 * @param radius
	 *            模糊半径
	 * @return bitmap
	 */
	public static Bitmap blur(Context context, Bitmap bitmap, int radius) {
		if (Build.VERSION.SDK_INT > 17) {
			return blurBitmapByRender(context, bitmap, radius);
		} else {
			return blurByGauss(bitmap, radius);
		}
	}

	/**
	 * 高斯模糊
	 * 
	 * @param srcBitmap
	 *            源位图
	 * @param radius
	 *            模糊半径
	 * @return bitmap
	 */
	public static Bitmap blurByGauss(Bitmap srcBitmap, int radius) {

		Bitmap bitmap = srcBitmap.copy(srcBitmap.getConfig(), true);

		if (radius < 1) {
			return (null);
		}

		int w = bitmap.getWidth();
		int h = bitmap.getHeight();

		int[] pix = new int[w * h];
		bitmap.getPixels(pix, 0, w, 0, 0, w, h);

		int wm = w - 1;
		int hm = h - 1;
		int wh = w * h;
		int div = radius + radius + 1;

		int r[] = new int[wh];
		int g[] = new int[wh];
		int b[] = new int[wh];
		int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
		int vmin[] = new int[Math.max(w, h)];

		int divsum = (div + 1) >> 1;
		divsum *= divsum;
		int temp = 256 * divsum;
		int dv[] = new int[temp];
		for (i = 0; i < temp; i++) {
			dv[i] = (i / divsum);
		}

		yw = yi = 0;

		int[][] stack = new int[div][3];
		int stackpointer;
		int stackstart;
		int[] sir;
		int rbs;
		int r1 = radius + 1;
		int routsum, goutsum, boutsum;
		int rinsum, ginsum, binsum;

		for (y = 0; y < h; y++) {
			rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
			for (i = -radius; i <= radius; i++) {
				p = pix[yi + Math.min(wm, Math.max(i, 0))];
				sir = stack[i + radius];
				sir[0] = (p & 0xff0000) >> 16;
				sir[1] = (p & 0x00ff00) >> 8;
				sir[2] = (p & 0x0000ff);
				rbs = r1 - Math.abs(i);
				rsum += sir[0] * rbs;
				gsum += sir[1] * rbs;
				bsum += sir[2] * rbs;
				if (i > 0) {
					rinsum += sir[0];
					ginsum += sir[1];
					binsum += sir[2];
				} else {
					routsum += sir[0];
					goutsum += sir[1];
					boutsum += sir[2];
				}
			}
			stackpointer = radius;

			for (x = 0; x < w; x++) {

				r[yi] = dv[rsum];
				g[yi] = dv[gsum];
				b[yi] = dv[bsum];

				rsum -= routsum;
				gsum -= goutsum;
				bsum -= boutsum;

				stackstart = stackpointer - radius + div;
				sir = stack[stackstart % div];

				routsum -= sir[0];
				goutsum -= sir[1];
				boutsum -= sir[2];

				if (y == 0) {
					vmin[x] = Math.min(x + radius + 1, wm);
				}
				p = pix[yw + vmin[x]];

				sir[0] = (p & 0xff0000) >> 16;
				sir[1] = (p & 0x00ff00) >> 8;
				sir[2] = (p & 0x0000ff);

				rinsum += sir[0];
				ginsum += sir[1];
				binsum += sir[2];

				rsum += rinsum;
				gsum += ginsum;
				bsum += binsum;

				stackpointer = (stackpointer + 1) % div;
				sir = stack[(stackpointer) % div];

				routsum += sir[0];
				goutsum += sir[1];
				boutsum += sir[2];

				rinsum -= sir[0];
				ginsum -= sir[1];
				binsum -= sir[2];

				yi++;
			}
			yw += w;
		}
		for (x = 0; x < w; x++) {
			rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
			yp = -radius * w;
			for (i = -radius; i <= radius; i++) {
				yi = Math.max(0, yp) + x;

				sir = stack[i + radius];

				sir[0] = r[yi];
				sir[1] = g[yi];
				sir[2] = b[yi];

				rbs = r1 - Math.abs(i);

				rsum += r[yi] * rbs;
				gsum += g[yi] * rbs;
				bsum += b[yi] * rbs;

				if (i > 0) {
					rinsum += sir[0];
					ginsum += sir[1];
					binsum += sir[2];
				} else {
					routsum += sir[0];
					goutsum += sir[1];
					boutsum += sir[2];
				}

				if (i < hm) {
					yp += w;
				}
			}
			yi = x;
			stackpointer = radius;
			for (y = 0; y < h; y++) {
				pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum];

				rsum -= routsum;
				gsum -= goutsum;
				bsum -= boutsum;

				stackstart = stackpointer - radius + div;
				sir = stack[stackstart % div];

				routsum -= sir[0];
				goutsum -= sir[1];
				boutsum -= sir[2];

				if (x == 0) {
					vmin[y] = Math.min(y + r1, hm) * w;
				}
				p = x + vmin[y];

				sir[0] = r[p];
				sir[1] = g[p];
				sir[2] = b[p];

				rinsum += sir[0];
				ginsum += sir[1];
				binsum += sir[2];

				rsum += rinsum;
				gsum += ginsum;
				bsum += binsum;

				stackpointer = (stackpointer + 1) % div;
				sir = stack[stackpointer];

				routsum += sir[0];
				goutsum += sir[1];
				boutsum += sir[2];

				rinsum -= sir[0];
				ginsum -= sir[1];
				binsum -= sir[2];

				yi += w;
			}
		}

		bitmap.setPixels(pix, 0, w, 0, 0, w, h);
		return bitmap;
	}

	/**
	 * 高斯局部模糊
	 * 
	 * @param context
	 *            上下文
	 * @param bitmap
	 *            模糊位图
	 * @param view
	 *            模糊区域
	 * @param radius
	 *            模糊半径
	 */
	public static void blurByGauss(Context context, Bitmap bitmap, View view, float radius) {
		// 得到要处理的区域
		Bitmap dstArea = getDstArea(bitmap, view);

		// 作模糊处理
		dstArea = blurByGauss(zoomImage(dstArea, 0.8f), (int) radius);

		// 设置背景
		view.setBackground(new BitmapDrawable(context.getResources(), dstArea));

		bitmap.recycle();
	}

	/**
	 * RenderScript模糊
	 * 
	 * @param context
	 *            上下文
	 * @param bitmap
	 *            源位图
	 * @param radius
	 *            模糊半径
	 * @return bitmap
	 */
	@SuppressLint("NewApi")
	public static Bitmap blurBitmapByRender(Context context, Bitmap bitmap, float radius) {
		Bitmap outBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
		RenderScript rs = RenderScript.create(context);
		ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
		Allocation allIn = Allocation.createFromBitmap(rs, bitmap);
		Allocation allOut = Allocation.createFromBitmap(rs, outBitmap);
		blurScript.setRadius(radius);
		blurScript.setInput(allIn);
		blurScript.forEach(allOut);
		allOut.copyTo(outBitmap);

		bitmap.recycle();
		rs.destroy();

		return outBitmap;
	}

	/**
	 * RenderScript局部模糊
	 * 
	 * @param context
	 *            上下文
	 * @param bitmap
	 *            模糊位图
	 * @param view
	 *            模糊区域
	 * @param radius
	 *            模糊半径
	 */
	@SuppressLint("NewApi")
	public static void blurByRender(Context context, Bitmap bitmap, View view, float radius) {
		// 得到要处理的区域
		Bitmap dstArea = getDstArea(bitmap, view);
		dstArea = zoomImage(dstArea, 0.8f);

		// 作模糊处理
		RenderScript rs = RenderScript.create(context);
		Allocation overlayAlloc = Allocation.createFromBitmap(rs, dstArea);
		ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(rs, overlayAlloc.getElement());
		blur.setInput(overlayAlloc);
		blur.setRadius(radius);
		blur.forEach(overlayAlloc);
		overlayAlloc.copyTo(dstArea);

		// 设置背景
		view.setBackground(new BitmapDrawable(context.getResources(), dstArea));

		bitmap.recycle();
		rs.destroy();
	}

	/**
	 * 得到待处理的位图
	 * 
	 * @param bitmap
	 *            模糊位图
	 * @param view
	 *            模糊区域
	 * @return bitmap
	 */
	public static Bitmap getDstArea(Bitmap bitmap, View view) {
		Bitmap dstArea = Bitmap.createBitmap((int) (view.getMeasuredWidth()), (int) (view.getMeasuredHeight()),
				Config.ARGB_8888);
		Canvas canvas = new Canvas(dstArea);
		canvas.translate(-view.getLeft(), -view.getTop());
		canvas.drawBitmap(bitmap, 0, 0, null);
		return dstArea;
	}

	/**
	 * 缩放图片
	 * 
	 * @param srcBitmap
	 *            源图
	 * @param newWidth
	 *            新宽
	 * @param newHeight
	 *            新高
	 * @return bitmap
	 */
	public static Bitmap zoomImage(Bitmap srcBitmap, float scale) {
		// 获取这个图片的宽和高
		float width = srcBitmap.getWidth();
		float height = srcBitmap.getHeight();
		// 创建操作图片用的matrix对象
		Matrix matrix = new Matrix();
		// 缩放图片动作
		matrix.postScale(scale, scale);
		Bitmap bitmap = Bitmap.createBitmap(srcBitmap, 0, 0, (int) width, (int) height, matrix, true);
		return bitmap;
	}

}
